Dutch Hollow Subwatershed Site 4-1, located in Woodbury County, Iowa, is a crucial water resource managed by the local government for multiple purposes, including fire protection, stock, small fish pond, and flood risk reduction. The dam, completed in 1984, is an earth structure standing at a height of 42 feet and stretching 530 feet in length. With a storage capacity of 104 acre-feet and a surface area of 5.3 acres, the dam plays a vital role in managing water flow and reducing the risk of flooding in the area.

Managed by the USDA NRCS and regulated by the Iowa DNR, Dutch Hollow Subwatershed Site 4-1 has a low hazard potential and a moderate risk assessment rating. The dam is designed to prevent uncontrolled spillage, ensuring the safety and stability of the surrounding environment. Despite not being rated for its current condition, the dam continues to serve its intended purposes effectively, with regular inspections and enforcement measures in place to address any potential concerns. Recognized as a valuable asset in water resource management, this site is a key component in the overall conservation efforts in the region.

As a part of the larger TR-Koker Creek watershed, Dutch Hollow Subwatershed Site 4-1 contributes to the overall ecological health and water quality of the area. With its strategic location and design, the dam helps maintain a balanced ecosystem while also providing essential services to the local community. As climate change continues to impact water resources, the management and maintenance of sites like Dutch Hollow Subwatershed Site 4-1 become increasingly important in ensuring the resilience and sustainability of the region's water infrastructure.